430 



INDEX 



Fertilisers, crude fish scrap, 386 



green manures not complete, 



332 



how to apply, 396 

 indirect, benefit the soil, 399 

 low grade, expensive, 375 

 many brands of, 367 

 new theory as to action, 519, 



320 

 nitrogen, quickly soluble, 



396 



quantivalence of, 370 

 raw materials can be bought, 



377 



seaweed, 386 

 tags, studying, 368 



guarantees on, 368 

 tobacco stems and stalks, 386 

 trade in, State supervision, 



367 



valuation of, schedule for, 426 

 value based on amount of 



plant food contained, 373 

 value of, 373 

 what kinds to use, 388 

 when complete and incom- 

 plete, 366 



when it pays to use, 398 

 wool and hair waste, 386 

 Fertilising materials in farm pro- 

 ducts, 423-425 

 Fertility, influence of plant food on, 



281 



lost in cropping, 312 

 loss by erosion, 286 

 maintenance,conflicting views 



on, 281 



of soil, to maintain, 280, 311 

 selling, 311 



soil, new theory of, 318-321 

 Fflm water, 30 



as plant food, 25, 30 

 held by soils, amount of, 81 

 movement of, 87, 90 

 need of, 31 

 to prevent loss of, 90 

 Fineness of soil, 25 

 Fire-fang or ferment, 349 

 Flooding, in irrigation, 254 

 Florida, rotation in, 407 

 Flume, how to build, 252, 258 

 Forest, preserve on hill crests, 289 

 Forests, influence on water supply, 

 84 



Free water, rainfall is, 29 



Fresh manure best for heavier soils, 



360 



Frost a soil refiner, 21 

 Furrow irrigation, 257-260 



Gang plow, 139 



Garden irrigation, 258 



Gases absorbed by the soil, 38 



German potash salts, sources of, 



385 



Germination of seeds, 99 

 Germ life in the soil, 40 

 Glacial soils, 49 

 Glaciers deposit soil, 11 

 Good texture, how Nature secures, 



323 



humus insures, 323 

 what is meant by, 322 

 Grade of tile drains, 210 

 to be uniform, 211 

 to establish, 212, 214 

 Gravelly loams, 59 

 Green manure benefits poor soils 



most, 336 

 darkens soil, 35 

 red clover the best, 338 

 two kinds of, 329 

 Green-manuring and worn-out soils, 



322 

 Green-manuring for impaired soil, 



330 



Green manures from non-legum- 

 inous crops, 341 

 not complete fertilisers, 332 

 when to plow under, 337 

 Guarantees, fertiliser, points for 



study of, 372, 373 

 Gullies, clay soils most liable, 294 



growth checked by breaks, 



294 

 Gypsum alleviates stable odours, 356 



Hand cultivators, 184 

 Hand tools, 183 

 Harrowing, objects of, 142 

 Harrow, Acme, 148 



cutaway, 149 



disk, 149 



kinds and use, 144-152 



Meeker, the, 150 



plank, 179 



rolling, 149 



smoothing, 147 



